Covering for pipes



(No Model.)

H. M. SMALL.

COVERING FOR PIPES, BOILERS; &c.

No. 353,981. Patented Dec. 7, 1886.

mass-s, .f/weni'oz' .firzerfiMSmaa N. FEYERS. Photo-Lithographer,Wnhinglun, n. c.

UNITED STATES PATENT QFFICE.

HERBERT M. SMALL, OF BALDVVINSVILLE, MASSACHUSETTS.

COVERING FOR PIPES, BOILERS, 800.

SPECIFICATION forming part of Letters Patent No. 353,981, dated December7, 1886.

Application filed April 30, 1886. Serial N0. 200,658. (No model.)

To aZZ whom it may concern.-

Be it known that I, HERBERT M. SMALL, of Bald winsville, county of\Vorcester, and State of Massachusetts, have invented an Improvement inCoverings for Pipes, Boilers, &c., of which the followingdescription,-in connection with the accompanying drawing. is aspecification, like letters on the drawing representing like parts.

This invention has for its object to provide a serviceable covering toprotect steam and other pipes or articles containing gases or fluids, toprevent loss of heat by radiation.

My improved covering is composed, essentially, of one or more layers ofsponge felt combined with one or more layers of ashestus. These layersmay have incorporated with them, if desired, one or more layers of hairfelt and one or more layers of paper, the latter being employed chieflyas an external finishing surface; but, if desired, this external papersurface may be protected externally by asbestus.

The drawing, in section, represents a cover-- ing embodying myinvention, the covering being of suitable shape to surround a pipe whichit is desired to protect.

In the drawing, P represents the pipe which it is desired to-protect.Surrounding this pipe and next to it is a layer, a, of asbestus,prepared preferably as a paper; or it may be made from flocky asbestus,together with a suitable cementitious material, preferably silica.Outside of this layer is a layer or sheet of what is known as spongefelt, the same consisting of paper or suitable pulp having mixed with itsmall pieces of sponge, substantially as described in United StatesPatent No. 130,222, to which reference may behad.

Herein I have shown four layers, a, of asbestus with three layers, b, ofsponge felt.

Outside of the outermost layer, a, of ashestus I have placed a layer, h,of hair felt, of usual construction. and outside of the hair felt I haveadded a layer, a, of asbestus and a layer, (Z, of paper or paper-board.

The sponge felt may have incorporated with it either asbestus orasbestine, or iufusorial earth, or other usual extender.

I have found the sponge felt b especially desirable as a covering forpipe, because the sponge holds the air, thus making the felt very porousand light, the air contained in the felt being a most efi'eetualnon-conductor of heat and cold.

I claim 1. A covering for pipes, &0., it being coniposed of one or morelayers of asbestus and of one or morelayers of sponge felt,substantially as described.

2. A covering composedof one or more layers of asbestos and one or morelayers of sponge felt, and a layer of hair felt, substantially asdescribed.

3. A covering consisting of one or more layers of sponge felt, one ormore layers of hair felt, and one or more layers of paper, substantiallyas described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

D. A. BRoWN, J. M. MOORE.

